The Rate Performance of Two-Dimensional Material-Based Battery Electrodes May Not Be as Good as Commonly Believed

Ruiyuan Tian, Madeleine Breshears, Dominik V. Horvath, Jonathan N. Coleman

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Two-dimensional (2D) materials show great potential for use in battery electrodes and are believed to be particularly promising for high-rate applications. However, there does not seem to be much hard evidence for the superior rate performance of 2D materials compared to non-2D materials. To examine this point, we have analyzed published rate-performance data for a wide range of 2D materials as well as non-2D materials for comparison. For each capacity-rate curve, we extract parameters that quantify performance which can then be analyzed using a simple mechanistic model. Contrary to expectations, by comparing a previously proposed figure of merit, we find 2D-based electrodes to be on average ∼40 times poorer in terms of rate performance than non-2D materials. This is not due to differences in solid-state diffusion times which were similarly distributed for 2D and non-2D materials. In fact, we found the main difference between 2D and non-2D materials is that ion mobility within the electrolyte-filled pores of the electrodes is significantly lower for 2D materials, a situation which we attribute to their high aspect ratios.

Original languageEnglish
Pages (from-to)3129-3140
Number of pages12
JournalACS Nano
Volume14
Issue number3
DOIs
StatePublished - 24 Mar 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 American Chemical Society.

Keywords

  • anode rate
  • cathode
  • current
  • diffusion coefficient
  • diffusivity
  • model
  • nanosheet

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